Drill



the drill collar.

Patented Apr. 24, 1928.

UNI ED STATES PATENT, 0mm

mm 1110011, or mna-rx,.. rma

mum.

Application and "August a, use. lertal no. mam.

' This invention relates to new and useful imsrovements in a drill.

ne object of the invention is to provide a drill of the character described comprising a-rotatable barrel, a drilling tool associated therewith and a hammer associated with the barrel and operable'thereby'as the barrel is rotated by the drill stem,'- and- .adapted to strike said tool with successive blows as said stem is rotated, to efl'fect the abrasion or disintegration, by said tool, of the formation at the bottomof the bore;

Another object of the invention is to provide a drill of the character described, of such formation that the movable parts thereof ma be readily lubricated.

Wit the above and other ob'ects in view this invention has particular relation to certain novel features ofconstruction, operation and-arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein:--

Figure 1 is a vertical sectional view of the upper end of the apparatus.

Figure 2 is a vertical sectional view of the lower end thereof.

Figure 3 is a transverse sectional view taken on the line 33 of Figure 1, and

Figure 4 is a transverse sectional view taken on the line 4-4 of Figure 2.

Referring now more particularly to the drawings, wherein like numerals of reference designate similar parts in eachof the figures the numeral 1 designates a tubular drill stem which is adapted to be rotated by the usual rotary drilling machine. Attached to the lower end of this drill stem there is a con ling 2 having a polygonal opening 3 theret rough and connected to the lower end of the coupling 2 is a tubular barrel 4. The numeral 5 designates a tubula r drill collar which is connected to the lower end of the barrel 4.

There is a drilling tool embodying a bit 6 and a separable tubular shank 7 which extends up 'into the drill collar 5. The collar 5 has an inside annular shoulder 8, and" the shank of the-drilling tool "has acorresponding external shoulder 9, said-shoulders being adapted to interengage to prevent the detachment of the drilling tool from Securedwithin the lower end of the drill collar and surrounding said shank there is a stufling box' composed of the packing 10 and the annular retaining 'wor - the nut 11. Sicre wed on the u r end-of the shank 7 there is a head 12 v? 'ch fits closely within the drill collar.

Within the barrel 4 there is a tubular hammer 13 whose u per end, or shank 14 is polygonal to con orm in shape to and fit through the opening 3 of the coupling '2 so that as the stem is rotated the hammer will turn with it. The coupling 2 has a lubricating rt 15 normally closed by the removable p ug 16 so that the bearing of the shank 14 through the; coupling 2 may be lubricated and the lubricant is retained therein by means of the upper and lower stufling boxes 17, 17, secured within thecouplin 2 and through which the shank 14 The lower end of the hammer is formed with an enlarged detachable head 18 which fits closely within the drill collar and carries the surrounding packing gland 19 to form a fluid tight joint with'said drill collar. The lower end of the hammer abuts the upper end of the head-12 and these resipective abutting ends have the oppositely isposed correspondingly inclined faces 20, 20, 21, 21,-which terminate in the oppositel arranged abrupt vertically disposed sh'ou ders 22, 23, respectively, the shoulders 22 facing in the direction the opposite of that of the shoulders 23. A tubing 24 has its upper end threaded into the lower end of hammer with its lower and free and working through the head 12 and a stufiing box 25 is mounted within said head around .the' tubular section 24.

In operation, with the drill collar 5 resting on the bit 6, as the stem 1 is rotated the hammer 13 will be rotated with it and the face 20 will ride up on the face 21 lifting the hammer until the shoulders 22 pass the shoulders 23'and the hammer will then drop thus striking the upper end of the head 12 in 'rapid succession and driving against the formation at the bottom of the bore and disintegrating the same. The slop ing face 20 striking the sloping face 21 will impart a partial rotation to the drillin'g too so that as formation at the bottom of the bore. For the purpose of lubricating the head 12 the lubricant port 26 has been provided and is normally closed by the removable plug 27 and through which the lubricant maiylbe supplied to said head.

drilling, water, or slush, will forced drilling proceeds the bit 3 will turn slightly and thus abrade away the the bit 6.

down throu h the stem and will ass on down throng the channel 28 of the ammer and thence down through the drilling tool and will be discharge at the lower end thereof. The packing glands hereinbefore described, are so disposed so asto exclude this slush and grit from the working parts of the tool and to retain the lubricantsupplied thereto.

The barrel 4 is (provided with upper and lower ports 29 an 30 through which fluid may enter into said barrel to equalize the pressure to prevent the barrel from becoming crushed by the excessive water pressure on the outside.

There is an enlarged head 31 screwed into the upper end of the shank 14. This head is provided so that in case the drill collar, or barrel 4, should become twisted in two, in withdrawing1 the stem this head 31 will engage with t e coupling 2, when the stem 1 is withdrawn, and the shank 14 and the parts connected thereto will be withdrawn from the bore with said stem.- lhe head 31 is outwardly threaded to receive the ordinary pipe cou in so that in handling the hammer about te errick the ordinar elevators may-be engaged around the shan 14: underneath said head and the hammer thus more conveniently handled through said elevators.

What I claim is.:

l. A drill including a rotatable stem, a coupling attached to the lower end of the stem and having a polygonal opening therethrough, a barrel connected to the lower end of said cou ling, a tubular drill collar connected to t e lower end of the barrel a drilling tool embodying a bit and a separable tubular shank which extends up into said collar and is rotatableindependently thereof, said collar and shank having interengaging shoulders to revent the detachment of the drilling tool f om the collar, 9. head connected to the upper end of said shank and fitting within said collar, a tubular hammer within the barrel whose upper end is polygonal and fits through the openin of said coupling, an enlarged detachable head, carried by the lower end of the hammer which fits closely within the drill collar and forms a fluid tight joint therewith, the lower end of the hammer head and the upper end of the shank head having oppositely disposed correspondingly inclined faces which terminate in oppositely arranged abrupt vertically disposed shoulders, a tubing whose upper end is threaded into the lower end of the hammer andwhose lower end'works through the head of said shank.

2. A drill including a rotatable stem, 9. coupling attached to'the lower end of the geezer? stem and having a polygonal o ening therethrough, a barrel connected to t e lower end of said cou lin a tubular drill collar connected to the lower end of the barrel, a drilling tool embodying a bit and a separable tubular shank which extends up into said collar and is rotatable independently thereof, said collar and shank having interengaging shoulders to prevent the detachment of the drilling tool from the collar, a head connected to the upper end of said shank and fitting within said collar, a tubular hammer within the barrel whose upper end is polygonal and fits through the openin of said cou ling, an enlarged detachable ead carried by the lower end of the hammer which fits closely within the drill collar and forms a fluid tight joint therewith, the lower end of the hammer head and the upper end of the shank head having 0 positely disposed correspondingly inclined aces which terminate in oppositely arranged abru t vertically disposed shoulders, a tubing w ose u per end is threaded into the lower end of t e hammer and whose lower end works through the head of said shank, said barrel having ports providing for the inlet of fluid into the same.

3. A drill including a rotatable stem, a coupling attached to the lower end of the stem and havin a polygonal opening therethrough a barre connected to thelower end of said couplin a tubular drill collar connected to the lower end of the barrel, a drilling tool embodyin'ga bit and a separable tubular shank which extends up into said collar and is rotatable independently thereof, said collar and shank having interengaging shoulders to prevent the detachment of the drillin tool from the collar, a head connected to t e upper end of said shank and fitting within said collar, a tubular hammer within the barrel whose upper end is polygonal and fits through the openin of said coupling, an enlarged detachable ead carried by the lower end of the hammer which fits closely within the drill collar and forms a fluid tight joint therewith, the lower end of the hammer head and the upper end of the shank head having 0 positely disposed correspondingly inclined aces which terminate 1n oppositely arranged abrupt vertically disposed shoulders, a tubing whose upper end is threaded into the lower end of the hammer and whose lower end works through the head of said shank, and an enlargement carried by the upperend of. said hammer shank.

In testimony whereof I have signed my name to this specificaio. 

